Hi Mark,
On Oct 7, 2010, at 10:20 PM, Mark Grosen wrote:
A wiki article on using JTAG to debug Linux kernel is here:
http://processors.wiki.ti.com/index.php/Linux_Debug_in_CCSv5
Note that you really do not need the TI CCS version of Eclipse to use kgdb -
you could just grab the generic version from eclipse.org
Thanks for the reply. I'm having trouble connecting to the target via the
serial console, I get a bunch of error messages when attempt to connect to kgdb
first via a command line. (It didn't work from standard Eclipse IDE, and that
doesn't give much info, but the command line does, thought CCS might have some
better support for this, but guess I have to resolve the command line
connectivity issues first before using the IDE.)
Here is what I've done.
I have the following u-boot environment variables set, for the console and
mmcargs bootargs
# setenv console ttyS2,115200n8
# setenv mmcargs 'setenv bootargs console=${console} vram=12M omapfb.vram=0:4M
omapfb.mode=dvi:${dvimode} omapdss.def_disp=${defaultdisplay}
root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait init=/init kgdboc=${console}
kgdbwait'
Testing it quickly with kermit gives the expected response
console [ttyS2] enabled
kgdb: Registered I/O driver kgdboc.
kgdb: Waiting for connection from remote gdb...
I have on the target board, ttys2, the TI OMAP 3503 serial port configured as
the debug console. and the board that I have has an FTDI to USB converter.
This when connected to the host appears as /dev/ttyUSB0
I then log in as root, after closing all previous sessions, power on the target
hardware (Gumstix Overo Earth TI OMAP 3503 based platform), and then type the
following commands, but get a bunch or error messages.
# su
# cd /tool/overo-oe/tmp/staging/overo-angstrom-linux-gnueabi/kernel
# arm-angstrom-linux-gnueabi-gdb
GNU gdb (GDB) 7.0
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type show copying
and show warranty for details.
This GDB was configured as --host=x86_64-linux
--target=arm-angstrom-linux-gnueabi.
For bug reporting instructions, please see:
http://www.gnu.org/software/gdb/bugs/.
(gdb) file vmlinux
Reading symbols from
/tool/overo-oe/tmp/staging/overo-angstrom-linux-gnueabi/kernel/vmlinux...done.
(gdb) set remotebaud 115200
(gdb) set debug remote 1
(gdb) set debug serial 1
(gdb) target remote /dev/ttyS0
Remote debugging using /dev/ttyS0
Sending packet: $qSupported#37...[
r Timeout: 2 seconds]Sending packet: $qSupported#37...[Timeout: 2
seconds]Sending packet: $qSupported#37...[Timeout: 2 seconds]Sending packet:
$qSupported#37...[Timeout: 2 seconds][Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Packet qSupported (supported-packets) is supported
warning: unrecognized item timeout in qSupported response
Sending packet: $Hg0#df...[Timeout: 2 seconds]Sending packet:
$Hg0#df...[Timeout: 2 seconds]Sending packet: $Hg0#df...[Timeout: 2
seconds]Sending packet: $Hg0#df...[Timeout: 2 seconds][Timeout: 2
seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Sending packet: $?#3f...[Timeout: 2 seconds]Sending packet:
$?#3f...[Timeout: 2 seconds]Sending packet: $?#3f...[Timeout: 2
seconds]Sending packet: $?#3f...[Timeout: 2 seconds][Timeout: 2
seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Sending packet: $Hc-1#09...[Timeout: 2 seconds]Sending packet:
$Hc-1#09...[Timeout: 2 seconds]Sending packet: $Hc-1#09...[Timeout: 2
seconds]Sending packet: $Hc-1#09...[Timeout: 2 seconds][Timeout: 2
seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Sending packet: $qC#b4...[Timeout: 2 seconds]Sending packet:
$qC#b4...[Timeout: 2 seconds]Sending packet: $qC#b4...[Timeout: 2
seconds]Sending packet: $qC#b4...[Timeout: 2 seconds][Timeout: 2
seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Sending packet: $qAttached#8f...[Timeout: 2 seconds]Sending packet:
$qAttached#8f...[Timeout: 2 seconds]Sending packet:
$qAttached#8f...[Timeout: 2 seconds]Sending packet:
$qAttached#8f...[Timeout: 2 seconds][Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed out.
Ignoring packet error, continuing...
Packet qAttached (query-attached) is supported
Sending packet: $qOffsets#4b...[Timeout: 2 seconds]Sending packet:
$qOffsets#4b...[Timeout: 2 seconds]Sending packet: $qOffsets#4b...[Timeout:
2 seconds]Sending packet: $qOffsets#4b...[Timeout: 2 seconds][Timeout: 2
seconds]Timed out.
[Timeout: 2 seconds]Timed out.
[Timeout: 2 seconds]Timed
